/*
 * Copyright (c) 2023-2025 elsfs Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.elsfs.cloud.common.mybatis.ext.sql.support.common;

import lombok.RequiredArgsConstructor;
import org.elsfs.cloud.common.mybatis.ext.sql.TableAliasManager;
import org.elsfs.cloud.common.util.lang.StringUtils;

/** 层级表别名管理器 */
@RequiredArgsConstructor
public class HierarchyTableAliasManager implements TableAliasManager {

  /** 代理表别名管理器 */
  private final TableAliasManager delegate;

  /** 父级表别名管理器 */
  private final TableAliasManager parent;

  /**
   * 生成表别名
   *
   * @param entityClass 表实体类
   * @return 别名
   */
  @Override
  public String generateAlias(Class<?> entityClass) {
    return this.delegate.generateAlias(entityClass);
  }

  /**
   * 生成表别名
   *
   * @param table 数据库表名
   * @return 别名
   */
  @Override
  public String generateAlias(String table) {
    return this.delegate.generateAlias(table);
  }

  /**
   * 注册表别名
   *
   * @param entityClass 表实体类
   * @param alias 别名
   */
  @Override
  public void registerAlias(Class<?> entityClass, String alias) {
    this.delegate.registerAlias(entityClass, alias);
  }

  /**
   * 注册表别名
   *
   * @param table 数据库表名
   * @param alias 别名
   */
  @Override
  public void registerAlias(String table, String alias) {
    this.delegate.registerAlias(table, alias);
  }

  /**
   * 获取表别名
   *
   * @param entityClass 表实体类
   * @return 表别名
   */
  @Override
  public String fetchTableAlias(Class<?> entityClass) {
    String alias = this.delegate.fetchTableAlias(entityClass);
    if (StringUtils.isBlank(alias)) {
      alias = this.parent.fetchTableAlias(entityClass);
    }

    return alias;
  }

  /**
   * 获取表别名
   *
   * @param table 数据库表名
   * @return 表别名
   */
  @Override
  public String fetchTableAlias(String table) {
    String alias = this.delegate.fetchTableAlias(table);
    if (StringUtils.isBlank(alias)) {
      alias = this.parent.fetchTableAlias(table);
    }

    return alias;
  }
}
